/*
 *  Brno University of Technology
 *
 *  Copyright (C) 2009-2010 by Brno University of Technology and the contributors
 *
 *  Complete list of developers available at our web site:
 *
 *       http://spl.utko.feec.vutbr.cz
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Lesser General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with this program.  If not, see http://www.gnu.org/licenses/.
 */
package cz.vutbr.feec.utko.ef.individuals;

/**
 * The Class TransitionAction allows a simple rule where the destination is only
 * one nonterminal/terminal (e.g. A::=B or A::=a) to not to define the action to
 * be defined on terminal. It simple takes an input from its parent and return
 * this value unchanged to the higher level.
 * 
 * Transition action can be performed only for a cases, where number of children
 * of a node is one.
 */
public class DummyAction extends ActionTree {

	/** The Constant serialVersionUID. */
	private static final long serialVersionUID = 2121016041731871880L;

	/* (non-Javadoc)
	 * @see cz.vutbr.feec.utko.ef.individuals.Action#getSymbol()
	 */
	@Override
	public String getSymbol() {
		return "";
	}

	/* (non-Javadoc)
	 * @see cz.vutbr.feec.utko.ef.individuals.Action#getValue(java.lang.Object[])
	 */
	@Override
	public Object getValue(Object... operands) {
		assert operands.length == 1;
		return operands[0];
	}
}
